Sectional nozzle for turbines.



PATENTED NOV. 8, 1904.

C. G. CURTIS.

SEGTIONAL NOZZLE FOR TURBINES.

APPLICATION FILED JUNE 17,1903.

N0 MODEL.

v v lnv ntor Witnesses:

I y I I I UNITED STATES CHAFRLES G. CURTIS,

SECTIONAL NOZZLE FOR TURBINES.

Patented November 8, 1904-.

OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 774,567, dated November 8, 1904.

Application filed June 17, 1903. Serial No. 161,840. (No model.)

To (oZZ whom it may concern:

Be it known that 1, CHARLES G. CURTIS, a citizen of the United States, residing in the borough of Manhattan, city of New York, State of New York, have invented a certain new and useful Improvement in Sectional Nozzles for Elastic-Fluid Turbines, of which the following is a description.

My invention relates to sectional nozzles for elastic-fluid turbines such as are covered by my Patent No. 700,744, dated May 27, 1902. Its purpose is to provide a construction which will enable the nozzle-sections to be more closely nested together for a given throat area, while preserving a desirable thickness to the walls separating the sections. I have found that this can be accomplished by making the nozzle-sections with throats of rectangular cross-section, the sections beyond the throats to the discharging ends of the sections being also rectangular in crosssection. The sections are provided with separate bowls or enlarged chambers anterior to the throats,

which may be of rectangular or of circular or other curved form. These bowls are connected separately, as described in said patent, or in groups, as described in my application for patent, Serial N 0. 82,570, filed November 16, 1901, with passages through which the elas: tic fluid is supplied to the nozzle, which passages are in the case of governed nozzles under the control of the governing mechanism. The rectangular throat construction is particularly well adapted to nozzles having little or no expansion; but in the case of expansionnozzles if an expansion is employed greater than can be provided by thickening the walls separating the sections at the throats without producing an undesirable separation ofthe sections the additional expansion is provided Figs. 4: and 5 are cross-sections on lines I 4 and 5 5, respectively, in Fig. 2. Fig. 6 is a view similar to Fig. 3, showinga rectangular form of bowl. Figs. 7 and 8 are views similar to Figs. at and 5, showing a greater expansion in the nozzle-sections produced by a greater divergence of the top and bottom walls; and Fig. 9 is a section on line 9 9 in Fig. 6 and also on the same line in Fig. 2 with the bowl in that figure through which thesection is taken assumed to have the rectangular form of Fig. 9.

The nozzle is preferably'a one-piece casting A, in which are nozzle-sections B, substantially alike inform and in angle of delivery and brought close together at their discharge ends, so that the jets or streams from adjacent sections will merge into a substantially single jet or stream at the' points of discharge, as described in my patent before referred to. The nozzle-sections have rectangular throats a and rectangular discharging portions 6. The side walls 0 of the discharging portions of the nozzle-sections may be parallel or they may diverge. The top and bottom walls (Z of the nozzle-sections may be parallel; but in the case of expansion-nozzles they may diverge to the same extent as the side walls, as shown in Figs. 2 to 5, or they may diverge to a greater extent than the side walls, as shown in Figs. 6 to 9. The nozzle-sections are provided with separate bowls or enlarged chambers e anterior to the throats, which may be circular or' rectangular in form, as illustrated.

The nozzle, as will be understood, is attached on the bowl side to a plate or block carrying passages which conduct the elastic fluid to the nozzle-sections singly or in groups and which supply-passages are, in the case of governed nozzles, under the control of the governing mechanism. H

The rectangular form of throat enables the nozzle-sections to be more" closely nested together for a given size or cross-sectional area of the throat, because of the fact that the surfaces of the'side walls at the throat are parallel, and the partition separating two nozzlesections can therefore be made of uniform thickness in vertical planes. This advantage would be in a large measure secured if the top and bottom Walls of the throat were curved so long as the side Walls are parallel to a substantial extent.

I Wish it understood that the expression rectangular as applied to the form of the throat of the nozzle sections includes all forms in Which the surfaces of the side Walls of the throat are parallel to a substantial extent, even though the top and. bottom Walls are not parallel.

WV hat I claim is- 1. A sectional nozzle for elastic-fluid turbines, consisting of a number of separate complete nozzle-sections, each having a contracted throat, a bowl orsupply-chamber anterior to and larger than said throat, and a discharging portion posterior to said throat, the throats of such nozzle-sections having a rectangular cross-section, substantially as set forth.

2. A sectional nozzle for elastic-fluid turbines, consisting of a number of separate complete nozzle-sections, each having a contracted throat, a bowl or supply-chamber anterior to and larger than said throat, and a discharging portion posterior to said throat,the throats and discharging portions of such nozzle-sections having a rectangular cross-section, substantially as set forth.

3. A sectional nozzle for elastic-fiuid turbines, consisting of a number of separate complete nozzle-sections, each having a contract ed throat, a bowl or supply-cha1nber anterior to and larger than said throat, and a discharging portion posterior to and enlarging beyond said throat, the throats of such nozzle-sections having a rectangular cross-section, substantially as set forth 4. A sectional nozzle for elastic-fluid turbines, consisting of a number of nozzle-sections, Whose throats have a rectangular crosssection, such nozzle-sections being separated by Walls Which are thicker at the throats than at the discharging ends of the sections, substantially as set forth.

5. A sectional nozzle for elastic-fluid turbines, consisting of a number of nozzle-sections, Whose throats have a rectangular crosssection, the discharging portions of the nozzle-sections being expanded in the direction of flow partly by the divergence of the side Walls and partly by the divergence of the top and bottom Walls of the sections, substantially as set forth.

6. A sectional nozzle for elastic-fluid turbines, consisting of a number of nozzle-sections, \vhose throats have a rectangular crosssection, the discharging portions of the nozzle-sections being expanded in the direction of flow partly by the divergence of the side Walls and partly by a greater divergence of the top and bottom Walls of the sections, substantially as set forth.

This specification signed and witnessed this 11th day of June, 1903.

CHARLES (Jr. CURTIS.

Witnesses:

JOHN R0131. TAYLOR, JOHN LoUIs LOTSCH. 

